/Engine/Plugins/Runtime/RigVM/Source/RigVMDeveloper/Public/RigVMBlueprint.h
[FName](API\Runtime\Core\UObject\FName) AddHostMemberVariableFromExternal ( [FRigVMExternalVariable](API\Plugins\RigVM\RigVMCore\FRigVMExternalVariable) InVariableToCreate, [FString](API\Runtime\Core\Containers\FString) InDefaultValue )